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Obstructive sleep apnoea syndrome: a possible cause of symptomatic hyperckaemia
  1. G Gutiérrez-Gutiérrez1,
  2. M Steiner2,
  3. O M Mediano San Andrés3
  1. 1
    Servicio de Neurología, Hospital Infanta Sofía, San Sebastián de los Reyes, Spain
  2. 2
    Servicio de Reumatología, Hospital Infanta Sofía, San Sebastián de los Reyes, Spain
  3. 3
    Servicio de Neumología, Hospital Infanta Sofía, San Sebastián de los Reyes, Spain
  1. Correspondence to Dr G Gutiérrez-Gutiérrez, Hospital Infanta Sofía, 6 portal 6 4B, San Sebastián de los Reyes 28702, Spain; g3.neuro{at}gmail.com

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A 41-year-old male presented to our hospital with complaints of muscle pain and stiffness in proximal muscles of 2 years with elevated creatinphosphokinase (CK). He had been previously studied in a rheumatology unit of another hospital, but a diagnosis was not achieved. He denies muscle weakness or coluria. There was no family history of myopathy. The muscle complaints were worse in the morning. They improved with non-steroidal anti-inflammatory drugs. He also referred fatigue, and excessive daily sleepiness. He scored 16 in the Epworth Sleepiness Scale (ESS) (normal up to 9).1 He snored, usually drank a glass of red wine each day, and did not take medication.

At examination, he had a body mass index (BMI) of 32. There was normal bulk and tone, and his strength was normal. The sensory examination and reflexes were also normal.

His lab test showed a CK of 353 (normal values …

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